FWIW, Arlen Specter and Jim Jeffords were Republicans. So was Dubya. But in his retirement, it appeared to me that he has become a Democrat. Meghan was only a Republican because his father was a Republican but now he's dead (RIP) it's safe to assume that she's a Democrat.
It doesn't matter what they call themselves. They don't own the Republican Party. They just think they do. Trump showed them otherwise and it pisses them off no end.